1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * kdebug.h: Defines and definitions for debugging the Linux kernel
4 * under various kernel debuggers.
5 *
6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 */
8 #ifndef _SPARC_KDEBUG_H
9 #define _SPARC_KDEBUG_H
10
11 #include <asm/openprom.h>
12 #include <asm/vaddrs.h>
13
14 /* Breakpoints are enter through trap table entry 126. So in sparc assembly
15 * if you want to drop into the debugger you do:
16 *
17 * t DEBUG_BP_TRAP
18 */
19
20 #define DEBUG_BP_TRAP 126
21
22 #ifndef __ASSEMBLY__
23 /* The debug vector is passed in %o1 at boot time. It is a pointer to
24 * a structure in the debuggers address space. Here is its format.
25 */
26
27 typedef unsigned int (*debugger_funct)(void);
28
29 struct kernel_debug {
30 /* First the entry point into the debugger. You jump here
31 * to give control over to the debugger.
32 */
33 unsigned long kdebug_entry;
34 unsigned long kdebug_trapme; /* Figure out later... */
35 /* The following is the number of pages that the debugger has
36 * taken from to total pool.
37 */
38 unsigned long *kdebug_stolen_pages;
39 /* Ok, after you remap yourself and/or change the trap table
40 * from what you were left with at boot time you have to call
41 * this synchronization function so the debugger can check out
42 * what you have done.
43 */
44 debugger_funct teach_debugger;
45 }; /* I think that is it... */
46
47 extern struct kernel_debug *linux_dbvec;
48
49 /* Use this macro in C-code to enter the debugger. */
50 static inline void sp_enter_debugger(void)
51 {
52 __asm__ __volatile__("jmpl %0, %%o7\n\t"
53 "nop\n\t" : :
54 "r" (linux_dbvec) : "o7", "memory");
55 }
56
57 #define SP_ENTER_DEBUGGER do { \
58 if((linux_dbvec!=0) && ((*(short *)linux_dbvec)!=-1)) \
59 sp_enter_debugger(); \
60 } while(0)
61
62 enum die_val {
63 DIE_UNUSED,
64 DIE_OOPS,
65 };
66
67 #endif /* !(__ASSEMBLY__) */
68
69 /* Some nice offset defines for assembler code. */
70 #define KDEBUG_ENTRY_OFF 0x0
71 #define KDEBUG_DUNNO_OFF 0x4
72 #define KDEBUG_DUNNO2_OFF 0x8
73 #define KDEBUG_TEACH_OFF 0xc
74
75 #endif /* !(_SPARC_KDEBUG_H) */